EC > GATE 2016 SET-1 > Nyquist Plot
A closed-loop control system is stable if the Nyquist plot of the corresponding open-loop transfer function
A
encircles the s-plane point (-1+j0) in the counterclockwise direction as many times as the number of right-half s-plane poles.
B
encircles the s-plane point (0-j1) in the clockwise direction as many times as the number of right-half s-plane poles.
C
encircles the s-plane point (-1+j0) in the counterclockwise direction as many times as the number of left-half s-plane poles.
D
encircles the s-plane point (-1+j0) in the counterclockwise direction as many times as the number of right-half s-plane zeros.

Correct : a

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